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Prospectus: rr_ProspectusTable  
Supplement Text Block ablstrarb-20181129_SupplementTextBlock


American Beacon Ionic Strategic Arbitrage Fund

Supplement dated November 29, 2018
to the
Prospectus and Summary Prospectus dated April 30, 2018

On November 6, 2018, the Board of Trustees of American Beacon Funds (the "Trust") approved: (i) an amendment to the existing investment advisory agreement among American Beacon Advisors, Inc., Ionic Capital Management LLC ("Ionic") and the Trust, on behalf of the American Beacon Ionic Strategic Arbitrage Fund (the "Fund"), whereby the fee rate payable to Ionic by the Fund with respect to the first $100 million in assets under management will be reduced by 0.20%, effective on or about December 1, 2018; and (ii) the lowering of the contractual expense ratio caps for all classes of the Fund, effective on or about December 1, 2018. Accordingly, the changes set forth below are effective on or about December 1, 2018:

1.
In the "Fund Summary – Fees and Expenses of the Fund" section, the tables below the first paragraph are deleted and replaced with the following:
 
Shareholder Fees (fees paid directly from your investment)
 
Share Class
A
C
Y
Institutional
Investor
Maximum sales charge imposed on purchases (as a percentage of offering price)
4.75%
None
None
None
None
Maximum deferred sales charge (as a percentage of the lower of original offering price or redemption proceeds)
0.50%1
1.00%
None
None
None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Share Class
A
C
Y
Institutional
Investor
Management Fee2
1.15%
1.15%
1.15%
1.15%
1.15%
Distribution and/or Services (12b-1) Fees
0.25%
1.00%
0.00%
0.00%
0.00%
Other Expenses
1.63%
1.40%
1.59%
1.32%
1.65%
     Dividend & Interest Expense on Securities Sold Short
1.05%
1.05%
1.05%
1.05%
1.05%
     Remainder of Other Expenses (including service fees)
0.58%
0.35%
0.54%
0.27%
0.60%
Acquired Fund Fees and Expenses
0.15%
0.15%
0.15%
0.15%
0.15%
Total Annual Fund Operating Expenses3
3.18%
3.70%
2.89%
2.62%
2.95%
Fee waiver and/or Expense Reimbursement or Recoupment4
(0.24%)
(0.01%)
(0.25%)
(0.08%)
(0.03)%
Total Annual Fund Operating Expenses after fee waiver and/or expense reimbursement or recoupment
2.94%
3.69%
2.64%
2.54%
2.92%

 1 
A contingent deferred sales charge (''CDSC'') of 0.50% will be charged on certain purchases of $1,000,000 or more of A Class shares that are redeemed in whole or part within 18 months of purchase.
 2  
The management fee has been restated to reflect a reduction in the contractual management fee.
 3  
The Total Annual Fund Operating Expenses do not correlate to the ratio of expenses to average net assets provided in the Fund's Financial Highlights table, which reflects the operating expenses of the Fund and does not include Acquired Fund Fees and Expenses and Dividend & Interest Expenses on Securities Sold Short.
 4  
American Beacon Advisors, Inc. (the "Manager") has contractually agreed to waive fees and/or reimburse expenses of the Fund's A Class, C Class, Y Class, Institutional Class and Investor Class shares, as applicable, through April 30, 2020 to the extent that Total Annual Fund Operating Expenses exceed 1.74% for the A Class, 2.49% for the C Class, 1.44% for the Y Class, 1.34% for the Institutional Class and 1.72% for the Investor Class (excluding taxes, interest, brokerage commissions, acquired fund fees and expenses, securities lending fees, expenses associated with securities sold short, litigation, and other extraordinary expenses). The contractual expense reimbursement can be changed or terminated only in the discretion and with the approval of a majority of the Fund's Board of Trustees. The Manager can be reimbursed by the Fund for any contractual fee waivers or expense reimbursements if reimbursement to the Manager (a) occurs within three years after the Manager's own waiver or reimbursement and (b) does not cause the Total Annual Fund Operating Expenses of a class to exceed the lesser of the contractual percentage limit in effect at the time of the waiver/reimbursement or the time of the recoupment.
 
2.
The "Fund Summaries – Fees and Expenses of the Fund - Example" section is deleted and replaced with the following:
 
Example
 
This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same, except that this Example reflects the fee waiver/expense reimbursement arrangement for each share class through April 30, 2020. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
 
Share Class
1 Year
3 Years
5 Years
10 Years
A
$758
$1,378
$2,032
$3,772
C
$471
$1,130
$1,910
$3,949
Y
$267
$861
$1,492
$3,188
Institutional
$257
$804
$1,380
$2,945
Investor
$295
$908
$1,549
$3,268
 
Assuming no redemption of shares:
 
Share Class
1 Year
3 Years
5 Years
10 Years
C
$371
$1,130
$1,910
$3,949
 
(American Beacon Funds - Supplement) | (American Beacon Ionic Strategic Arbitrage Fund)  
Prospectus: rr_ProspectusTable  
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption <p style="font-size:10pt;padding-top:2;padding-bottom:0;padding-left:0;"><b>Shareholder Fees (fees paid directly from your investment)</b></p>
Operating Expenses Caption [Text] rr_OperatingExpensesCaption <p style="font-size:10pt;padding-top:2;padding-bottom:0;padding-left:0;"><b>Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)</b></p>
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination April 30, 2020
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock A contingent deferred sales charge (''CDSC'') of 0.50% will be charged on certain purchases of $1,000,000 or more of A Class shares that are redeemed in whole or part within 18 months of purchase.
Expense Example [Heading] rr_ExpenseExampleHeading <p style="font-size:10pt;padding-top:2;padding-bottom:0;padding-left:0;"><b>Example</b></p>
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same, except that this Example reflects the fee waiver/expense reimbursement arrangement for each share class through April 30, 2020. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption <p style="font-size:10pt;padding-top:2;padding-bottom:0;padding-left:0;"><b>Assuming no redemption of shares:</b></p>
(American Beacon Funds - Supplement) | (American Beacon Ionic Strategic Arbitrage Fund) | Class A  
Prospectus: rr_ProspectusTable  
Maximum sales charge imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.75%
Maximum deferred sales charge (as a percentage of the lower of original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther 0.50% [1]
Management Fee rr_ManagementFeesOverAssets 1.15% [2]
Distribution and/or Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 1.63%
Dividend & Interest Expense on Securities Sold Short rr_Component1OtherExpensesOverAssets 1.05%
Remainder of Other Expenses (including service fees) rr_Component2OtherExpensesOverAssets 0.58%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.15%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 3.18% [3]
Fee waiver and/or Expense Reimbursement or Recoupment rr_FeeWaiverOrReimbursementOverAssets (0.24%) [4]
Total Annual Fund Operating Expenses after fee waiver and/or expense reimbursement or recoupment rr_NetExpensesOverAssets 2.94%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 758
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,378
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 2,032
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 3,772
(American Beacon Funds - Supplement) | (American Beacon Ionic Strategic Arbitrage Fund) | Class C  
Prospectus: rr_ProspectusTable  
Maximum sales charge imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (as a percentage of the lower of original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fee rr_ManagementFeesOverAssets 1.15% [2]
Distribution and/or Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 1.40%
Dividend & Interest Expense on Securities Sold Short rr_Component1OtherExpensesOverAssets 1.05%
Remainder of Other Expenses (including service fees) rr_Component2OtherExpensesOverAssets 0.35%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.15%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 3.70% [3]
Fee waiver and/or Expense Reimbursement or Recoupment rr_FeeWaiverOrReimbursementOverAssets (0.01%) [4]
Total Annual Fund Operating Expenses after fee waiver and/or expense reimbursement or recoupment rr_NetExpensesOverAssets 3.69%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 471
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,130
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,910
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 3,949
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 371
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 1,130
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,910
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 3,949
(American Beacon Funds - Supplement) | (American Beacon Ionic Strategic Arbitrage Fund) | Class Y  
Prospectus: rr_ProspectusTable  
Maximum sales charge imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (as a percentage of the lower of original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Management Fee rr_ManagementFeesOverAssets 1.15% [2]
Distribution and/or Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 1.59%
Dividend & Interest Expense on Securities Sold Short rr_Component1OtherExpensesOverAssets 1.05%
Remainder of Other Expenses (including service fees) rr_Component2OtherExpensesOverAssets 0.54%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.15%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.89% [3]
Fee waiver and/or Expense Reimbursement or Recoupment rr_FeeWaiverOrReimbursementOverAssets (0.25%) [4]
Total Annual Fund Operating Expenses after fee waiver and/or expense reimbursement or recoupment rr_NetExpensesOverAssets 2.64%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 267
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 861
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,492
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 3,188
(American Beacon Funds - Supplement) | (American Beacon Ionic Strategic Arbitrage Fund) | Institutional Class  
Prospectus: rr_ProspectusTable  
Maximum sales charge imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (as a percentage of the lower of original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Management Fee rr_ManagementFeesOverAssets 1.15% [2]
Distribution and/or Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 1.32%
Dividend & Interest Expense on Securities Sold Short rr_Component1OtherExpensesOverAssets 1.05%
Remainder of Other Expenses (including service fees) rr_Component2OtherExpensesOverAssets 0.27%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.15%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.62% [3]
Fee waiver and/or Expense Reimbursement or Recoupment rr_FeeWaiverOrReimbursementOverAssets (0.08%) [4]
Total Annual Fund Operating Expenses after fee waiver and/or expense reimbursement or recoupment rr_NetExpensesOverAssets 2.54%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 257
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 804
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,380
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,945
(American Beacon Funds - Supplement) | (American Beacon Ionic Strategic Arbitrage Fund) | Investor Class  
Prospectus: rr_ProspectusTable  
Maximum sales charge imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (as a percentage of the lower of original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Management Fee rr_ManagementFeesOverAssets 1.15% [2]
Distribution and/or Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 1.65%
Dividend & Interest Expense on Securities Sold Short rr_Component1OtherExpensesOverAssets 1.05%
Remainder of Other Expenses (including service fees) rr_Component2OtherExpensesOverAssets 0.60%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.15%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.95% [3]
Fee waiver and/or Expense Reimbursement or Recoupment rr_FeeWaiverOrReimbursementOverAssets (0.03%) [4]
Total Annual Fund Operating Expenses after fee waiver and/or expense reimbursement or recoupment rr_NetExpensesOverAssets 2.94%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 295
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 908
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,549
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 3,268
[1] A contingent deferred sales charge (''CDSC'') of 0.50% will be charged on certain purchases of $1,000,000 or more of A Class shares that are redeemed in whole or part within 18 months of purchase.
[2] The management fee has been restated to reflect a reduction in the contractual management fee.
[3] The Total Annual Fund Operating Expenses do not correlate to the ratio of expenses to average net assets provided in the Fund's Financial Highlights table, which reflects the operating expenses of the Fund and does not include Acquired Fund Fees and Expenses and Dividend & Interest Expenses on Securities Sold Short.
[4] American Beacon Advisors, Inc. (the "Manager") has contractually agreed to waive fees and/or reimburse expenses of the Fund's A Class, C Class, Y Class, Institutional Class and Investor Class shares, as applicable, through April 30, 2020 to the extent that Total Annual Fund Operating Expenses exceed 1.74% for the A Class, 2.49% for the C Class, 1.44% for the Y Class, 1.34% for the Institutional Class and 1.72% for the Investor Class (excluding taxes, interest, brokerage commissions, acquired fund fees and expenses, securities lending fees, expenses associated with securities sold short, litigation, and other extraordinary expenses). The contractual expense reimbursement can be changed or terminated only in the discretion and with the approval of a majority of the Fund's Board of Trustees. The Manager can be reimbursed by the Fund for any contractual fee waivers or expense reimbursements if reimbursement to the Manager (a) occurs within three years after the Manager's own waiver or reimbursement and (b) does not cause the Total Annual Fund Operating Expenses of a class to exceed the lesser of the contractual percentage limit in effect at the time of the waiver/reimbursement or the time of the recoupment.